JP5688963B2 - Engine exhaust purification system - Google Patents
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- JP5688963B2 JP5688963B2 JP2010281131A JP2010281131A JP5688963B2 JP 5688963 B2 JP5688963 B2 JP 5688963B2 JP 2010281131 A JP2010281131 A JP 2010281131A JP 2010281131 A JP2010281131 A JP 2010281131A JP 5688963 B2 JP5688963 B2 JP 5688963B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本発明は、エンジンの排気に含まれるＮＯｘ（窒素酸化物）を浄化する排気浄化装置に関する。 The present invention relates to an exhaust purification device that purifies NOx (nitrogen oxide) contained in engine exhaust.
エンジンの排気に含まれるＮＯｘを浄化する排気浄化システムとして、特開２００９−２４６５４号公報（特許文献１）に記載される排気浄化装置が提案されている。この排気浄化装置は、エンジン排気通路に配設されたＳＣＲ（Selective Catalytic Reduction）触媒の排気上流に、エンジン運転状態に応じた流量で液体還元剤又はその前駆体を噴射供給し、ＳＣＲ触媒で排気中のＮＯｘを選択的に還元反応させることで、ＮＯｘを無害成分に浄化処理する。また、この排気浄化装置では、噴射ノズルを含む噴射装置から噴射供給された液体還元剤又はその前駆体と排気との混合を促進するために、噴射ノズルとＳＣＲ触媒との間に位置する排気通路に混合装置（ミキサ）を配設する構成が採用されている。 As an exhaust purification system that purifies NOx contained in engine exhaust, an exhaust purification device described in Japanese Patent Application Laid-Open No. 2009-24654 (Patent Document 1) has been proposed. This exhaust purification device injects and supplies a liquid reducing agent or a precursor thereof at a flow rate corresponding to the engine operating state upstream of an SCR (Selective Catalytic Reduction) catalyst disposed in an engine exhaust passage, and exhausts the SCR catalyst. The NOx in the inside is selectively reduced to purify NOx into harmless components. Further, in this exhaust purification device, an exhaust passage located between the injection nozzle and the SCR catalyst in order to promote mixing of the liquid reducing agent or its precursor supplied from the injection device including the injection nozzle with the exhaust gas. The structure which arrange | positions a mixing apparatus (mixer) is employ | adopted.
しかしながら、排気通路に混合装置を配設することで、液体還元剤又はその前駆体と排気との混合が促進される一方、噴射ノズルから噴射供給された液体還元剤又はその前駆体が混合装置に付着し、液体還元剤又はその前駆体に由来する物質が析出されてしまうおそれがある。混合装置に液体還元剤又はその前駆体に由来する物質が過度に析出されると、排気通路における流路面積が小さくなり、例えば、排圧上昇による燃費や出力の低下の恐れがある。 However, by arranging the mixing device in the exhaust passage, the mixing of the liquid reducing agent or its precursor and the exhaust is promoted, while the liquid reducing agent or its precursor supplied from the injection nozzle is supplied to the mixing device. There exists a possibility that the substance which adheres and the liquid origin derived from a liquid reducing agent or its precursor may precipitate. If a substance derived from the liquid reducing agent or its precursor is excessively deposited in the mixing device, the flow passage area in the exhaust passage becomes small, and there is a risk that the fuel consumption and output will be reduced due to, for example, increased exhaust pressure.
そこで、本発明は従来技術の問題点に鑑み、液体還元剤又はその前駆体に由来する物質が混合装置に析出し難くした排気浄化装置を提供することを目的とする。 Therefore, in view of the problems of the prior art, an object of the present invention is to provide an exhaust purification device in which a substance derived from a liquid reducing agent or a precursor thereof is hardly deposited on a mixing device.
エンジンの排気浄化装置は、還元剤を使用して排気中のＮＯｘを選択還元浄化するＳＣＲ触媒と、ＳＣＲ触媒の排気上流に液体還元剤又はその前駆体を噴射供給する噴射ノズルと、噴射ノズルとＳＣＲ触媒との間に位置する排気通路に配設され、噴射ノズルから噴射供給された液体還元剤又はその前駆体と排気との混合を促進するフィンを備えた混合装置と、を有する。そして、混合装置のフィンを、電力の供給を受けて発熱する電熱帯であって、排気通路の横断面上に配設された、排気流の上流及び下流に複数回屈曲する少なくとも１条の電熱帯で構成する。または、混合装置のフィンを、電力の供給を受けて発熱する電熱帯であって、排気通路の複数の横断面上において、排気通路を横切るように角度差をもって配設された、螺旋状に捩じられた少なくとも２条の電熱帯で構成する。 An exhaust purification device for an engine includes an SCR catalyst that selectively reduces and purifies NOx in exhaust using a reducing agent, an injection nozzle that injects and supplies a liquid reducing agent or a precursor thereof upstream of the exhaust of the SCR catalyst, an injection nozzle, And a mixing device provided with a fin that is disposed in an exhaust passage located between the SCR catalyst and promotes mixing of the liquid reducing agent or its precursor injected from the injection nozzle with the exhaust gas. The fins of the mixing device are electrotropics that generate heat when supplied with electric power, and are disposed on the cross section of the exhaust passage and bent at a plurality of times upstream and downstream of the exhaust flow. Consists of the tropics . Alternatively, the fins of the mixing device are electrotropics that generate heat when supplied with electric power, and are spirally twisted and arranged with an angular difference across the exhaust passage on a plurality of cross sections of the exhaust passage. Consists of at least two striped electrotropics.
液体還元剤又はその前駆体に由来する物質の融点以上までフィンを発熱させることで、フィンに付着した液体還元剤又はその前駆体から結晶が析出することを抑制できる。また、フィンに結晶が析出しても、これが融点以上まで加熱されて溶解するため、その結晶を容易に除去できる。 By causing the fin to generate heat up to the melting point of the substance derived from the liquid reducing agent or its precursor, it is possible to suppress the precipitation of crystals from the liquid reducing agent or its precursor attached to the fin. Even if crystals are deposited on the fins, they are heated to a melting point or higher and dissolved, so that the crystals can be easily removed.
以下、添付された図面を参照し、本発明を実施するための実施形態について詳細に説明する。
図１は、排気浄化装置を搭載したディーゼルエンジンの概要を示す。
ディーゼルエンジン１０の吸気マニフォールド１２に接続される吸気管１４には、吸気流通方向に沿って、吸気中の埃などを濾過するエアクリーナ１６、ターボチャージャ１８のコンプレッサ１８Ａ、ターボチャージャ１８により高温となった吸気を冷却するインタークーラ２０、吸気脈動を平滑化する吸気コレクタ２２がこの順番で配設される。
Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an outline of a diesel engine equipped with an exhaust purification device.
The intake pipe 14 connected to the intake manifold 12 of the diesel engine 10 is heated by the air cleaner 16 that filters dust and the like in the intake air, the compressor 18A of the turbocharger 18 and the turbocharger 18 along the intake flow direction. An intercooler 20 for cooling the intake air and an intake collector 22 for smoothing the intake pulsation are arranged in this order.
一方、ディーゼルエンジン１０の排気マニフォールド２４に接続される排気管２６（排気通路）には、排気流通方向に沿って、ターボチャージャ１８のタービン１８Ｂ、連続再生式ディーゼルパティキュレートフィルタ（ＤＰＦ；Diesel Particulate Filter）装置２８、還元剤前駆体としての尿素水溶液を噴射供給する噴射ノズル３０、尿素水溶液から生成されるアンモニアを使用してＮＯｘを選択還元浄化するＳＣＲ触媒３２、ＳＣＲ触媒３２を通過したアンモニアを酸化させる酸化触媒３４がこの順番で配設される。連続再生式ＤＰＦ装置２８は、少なくともＮＯ（一酸化窒素）をＮＯ2（二酸化窒素）へと酸化させるＤＯＣ（Diesel Oxidation Catalyst）２８Ａと、ＰＭ（Particulate Matter）を捕集・除去するＤＰＦ２８Ｂと、を有する。なお、ＤＰＦ２８Ｂの代わりに、その基体表面に触媒（活性成分及び添加成分）を担持させたＣＳＦ（Catalyzed Soot Filter）を使用することもできる。 On the other hand, in the exhaust pipe 26 (exhaust passage) connected to the exhaust manifold 24 of the diesel engine 10, a turbine 18B of the turbocharger 18 and a continuously regenerating diesel particulate filter (DPF; Diesel Particulate Filter) are arranged along the exhaust circulation direction. ) Device 28, injection nozzle 30 for injecting and supplying urea aqueous solution as a reducing agent precursor, SCR catalyst 32 for selectively reducing and purifying NOx using ammonia generated from urea aqueous solution, and oxidizing ammonia that has passed through SCR catalyst 32 The oxidation catalyst 34 is disposed in this order. The continuous regeneration type DPF device 28 includes a DOC (Diesel Oxidation Catalyst) 28A that oxidizes at least NO (nitrogen monoxide) to NO 2 (nitrogen dioxide), and a DPF 28B that collects and removes PM (Particulate Matter). Have. Instead of DPF 28B, a CSF (Catalyzed Soot Filter) in which a catalyst (active component and additive component) is supported on the surface of the substrate can also be used.
また、噴射ノズル３０とＳＣＲ触媒３２との間に位置する排気管２６には、噴射ノズル３０から噴射供給された尿素水溶液と排気との混合を促進するフィンを備えた混合装置３６が配設される。混合装置３６は、別名「ミキサ」と称され、例えば、ここを通過した流体にフィンで旋回流や乱流を生じさせるものである。
混合装置３６は、図２に示すように、排気管２６のフランジ間に挟持固定される略矩形形状の板部材３６Ａを有する。板部材３６Ａは、排気管２６のフランジに固定するためのボルト挿通孔３６Ｂが四隅に開設されると共に、板面の略中央に排気通路の一部となる円形穴３６Ｃが開設される。円形穴３６Ｃには、板面が排気流と略平行な複数の板材からなる格子状の支持部材３６Ｄが配設され、その排気上流又は排気下流の少なくとも一方に、矩形形状の電熱帯からなる複数のフィン３６Ｅの基端が取り付けられる。電熱帯からなるフィン３６Ｅは、板部材３６Ａの外周に取り付けられた端子３６Ｆに電力の供給を受けて発熱する。なお、電熱帯としては、例えば、ＦＣＨＲ−１を素材とする、鉄−クロム電熱帯（１種、２種）などを使用することができる。
The exhaust pipe 26 positioned between the injection nozzle 30 and the SCR catalyst 32 is provided with a mixing device 36 having fins that promote mixing of the urea aqueous solution injected from the injection nozzle 30 and the exhaust gas. The The mixing device 36 is also called “mixer”. For example, the mixing device 36 generates a swirling flow or a turbulent flow with fins in the fluid that has passed through the mixing device 36.
As shown in FIG. 2, the mixing device 36 includes a substantially rectangular plate member 36 </ b> A that is sandwiched and fixed between the flanges of the exhaust pipe 26. The plate member 36 </ b> A has bolt insertion holes 36 </ b> B for fixing to the flange of the exhaust pipe 26 at four corners, and a circular hole 36 </ b> C serving as a part of the exhaust passage is formed at substantially the center of the plate surface. The circular hole 36C is provided with a lattice-like support member 36D made of a plurality of plate members whose plate surfaces are substantially parallel to the exhaust flow, and a plurality of rectangular electrotropics are formed at least upstream or downstream of the exhaust. The proximal end of the fin 36E is attached. The fins 36E made of electrotropy generate heat when power is supplied to terminals 36F attached to the outer periphery of the plate member 36A. In addition, as electrotropy, the iron-chromium electrotropy (1 type, 2 types) etc. which use FCHR-1 as a raw material can be used, for example.
還元剤タンク３８に貯蔵される尿素水溶液は、ポンプ及び流量制御弁が内蔵された還元剤添加ユニット４０を経由して、噴射ノズル３０に供給される。ここで、還元剤添加ユニット４０としては、ポンプが内蔵されたポンプモジュールと、流量制御弁が内蔵されたドージングモジュールと、に２分割された構成であってもよい。
連続再生式ＤＰＦ装置２８と噴射ノズル３０との間に位置する排気管２６には、排気の温度（排気温度）を検出する温度センサ４２が取り付けられる。温度センサ４２の出力信号は、コンピュータを内蔵した還元剤添加コントロールユニット（ＤＣＵ；Dosing Control Unit）４４に入力される。また、ＤＣＵ４４は、エンジン運転状態としての回転速度及び負荷を任意の時点で読み込み可能とすべく、ＣＡＮ（Controller Area Network）などの車載ネットワークを介して、ディーゼルエンジン１０を電子制御するエンジンコントロールユニット（ＥＣＵ；Engine Control Unit）４６に接続される。そして、ＤＣＵ４４は、ＲＯＭ（Read Only Memory）などに記憶された制御プログラムを実行することで、排気温度、回転速度及び負荷に応じて還元剤添加ユニット４０を電子制御する。
The aqueous urea solution stored in the reducing agent tank 38 is supplied to the injection nozzle 30 via a reducing agent addition unit 40 having a built-in pump and flow control valve. Here, the reducing agent addition unit 40 may be configured to be divided into two parts: a pump module with a built-in pump and a dosing module with a built-in flow control valve.
A temperature sensor 42 for detecting the temperature of exhaust gas (exhaust temperature) is attached to the exhaust pipe 26 positioned between the continuous regeneration type DPF device 28 and the injection nozzle 30. The output signal of the temperature sensor 42 is input to a reducing agent addition control unit (DCU; Dosing Control Unit) 44 incorporating a computer. Further, the DCU 44 is an engine control unit (electronic control unit) that electronically controls the diesel engine 10 via an in-vehicle network such as a CAN (Controller Area Network) so that the rotational speed and load as an engine operating state can be read at an arbitrary time. ECU; Engine Control Unit) 46. Then, the DCU 44 executes a control program stored in a ROM (Read Only Memory) or the like to electronically control the reducing agent addition unit 40 according to the exhaust temperature, the rotation speed, and the load.
ここで、ディーゼルエンジン１０の負荷としては、例えば、燃料噴射量、吸気流量、吸気圧力、過給圧力、アクセル操作量などトルクと密接に関連する状態量を使用することができる。また、ディーゼルエンジン１０の回転速度及び負荷は、ＥＣＵ４６から読み込む構成に限らず、公知のセンサを用いて直接検出するようにしてもよい。
かかる排気浄化装置において、ディーゼルエンジン１０の排気は、排気マニフォールド２４、ターボチャージャ１８のタービン１８Ｂを経て、連続再生式ＤＰＦ装置２６のＤＯＣ２８Ａに導入される。ＤＯＣ２８Ａに導入された排気は、ＮＯがＮＯ2へと酸化されつつＤＰＦ２８Ｂへと流れる。ＤＰＦ２８Ｂでは、排気中のＰＭが捕集・除去されると共に、ＤＯＣ２８Ａにより生成されたＮＯ2を使用してＰＭが連続的に酸化（焼却）される。
Here, as the load of the diesel engine 10, for example, a state quantity closely related to the torque such as a fuel injection amount, an intake air flow rate, an intake pressure, a supercharging pressure, and an accelerator operation amount can be used. The rotational speed and load of the diesel engine 10 are not limited to the configuration read from the ECU 46, and may be directly detected using a known sensor.
In such an exhaust purification device, the exhaust of the diesel engine 10 is introduced into the DOC 28A of the continuous regeneration type DPF device 26 through the exhaust manifold 24 and the turbine 18B of the turbocharger 18. Exhaust introduced into DOC28A flows to DPF28B being oxidized NO is to NO 2. In the DPF 28B, PM in the exhaust gas is collected and removed, and PM is continuously oxidized (incinerated) using NO 2 generated by the DOC 28A.
また、エンジン運転状態に応じて噴射ノズル３０から噴射供給（添加）された尿素水溶液は、混合装置３６により排気との混合が促進されつつ、排気熱及び排気中の水蒸気を使用して加水分解され、還元剤として機能するアンモニアへと転化される。このアンモニアは、ＳＣＲ触媒３２において排気中のＮＯｘと選択還元反応し、無害なＨ2Ｏ（水）及びＮ2（窒素）へと浄化されることは知られたことである。このとき、ＤＯＣ２８ＡによりＮＯがＮＯ2へと酸化され、排気中のＮＯとＮＯ2との比率が選択還元反応に適したものに改善されるため、ＳＣＲ触媒３２におけるＮＯｘ浄化率を向上させることができる。一方、ＳＣＲ触媒３２を通過したアンモニアは、その排気下流に配設された酸化触媒３４により酸化されるので、アンモニアがそのまま大気中に放出されることを抑制できる。 Further, the urea aqueous solution supplied (added) from the injection nozzle 30 according to the engine operating state is hydrolyzed by using the exhaust heat and the steam in the exhaust while the mixing device 36 promotes the mixing with the exhaust. Converted to ammonia, which functions as a reducing agent. It is known that this ammonia is selectively reduced with NOx in the exhaust gas in the SCR catalyst 32 and purified to harmless H 2 O (water) and N 2 (nitrogen). At this time, NO is oxidized to NO 2 by the DOC 28A, and the ratio of NO to NO 2 in the exhaust gas is improved to be suitable for the selective reduction reaction, so that the NOx purification rate in the SCR catalyst 32 can be improved. it can. On the other hand, the ammonia that has passed through the SCR catalyst 32 is oxidized by the oxidation catalyst 34 disposed downstream of the exhaust gas, so that it is possible to suppress the ammonia from being released into the atmosphere as it is.
さらに、排気管２６に配設された混合装置３６は、噴射ノズル３０から噴射供給された尿素水溶液と排気との混合を促進するフィン３６Ｅが電熱帯から構成されているので、その端子３６Ｆに電力を供給することで、次のような効果が奏される。即ち、電熱帯からなるフィン３６Ｅを尿素の融点以上に加熱することで、フィン３６Ｅに尿素水溶液が付着しても、これが溶質たる尿素の融点以上に昇温されるため、フィン３６Ｅに尿素結晶が析出することを抑制できる。また、フィン３６Ｅに付着した尿素水溶液から溶媒たる水が蒸発して尿素結晶が析出されても、これが溶解されて除去される。 Further, the mixing device 36 disposed in the exhaust pipe 26 has a fin 36E that promotes the mixing of the urea aqueous solution sprayed and supplied from the spray nozzle 30 and the exhaust gas, so that electric power is supplied to the terminal 36F. The following effects can be achieved by supplying. That is, even if an aqueous urea solution adheres to the fin 36E by heating the fin 36E made of electrotropy above the melting point of urea, the temperature rises above the melting point of urea as a solute, so that urea crystals are formed on the fin 36E. Precipitation can be suppressed. Further, even when the water as the solvent evaporates from the urea aqueous solution adhering to the fin 36E and the urea crystals are precipitated, this is dissolved and removed.
このため、混合装置３６に尿素結晶が析出し難くなり、排圧上昇による燃費や出力の低下を抑制することができる。
混合装置３６としては、図２に示すものに限らず、図３に示すように、排気管２６の横断面上に配設された板部材３６Ａの円形穴３６Ｃに対して、排気流の上流及び下流に複数回屈曲する少なくとも１条の電熱帯からなるフィン３６Ｅを取り付けてもよい。即ち、少なくとも１条の電熱帯からなるフィン３６Ｅを遮蔽物として、複数回屈曲する電熱帯の排気上流面を利用して混合を促進させる。
For this reason, it becomes difficult for urea crystals to precipitate in the mixing device 36, and it is possible to suppress a decrease in fuel consumption and output due to an increase in exhaust pressure.
The mixing device 36 is not limited to the one shown in FIG. 2, and as shown in FIG. 3, the upstream side of the exhaust flow and the circular hole 36C of the plate member 36A disposed on the cross section of the exhaust pipe 26 You may attach the fin 36E which consists of an at least 1 piece electrotropics bent several times downstream. In other words, mixing is promoted by utilizing the exhaust upstream surface of the electrotropical bent a plurality of times, with the fin 36E formed of at least one electrotropic as a shield.
また、他の混合装置３６としては、図４に示すように、板部材３６Ａの円形穴３６Ｃにおける複数の横断面に角度差（例えば、９０°の角度差）をもって配設された、螺旋状に捩じられた少なくとも２条の電熱帯からなるフィン３６Ｅを取り付けてもよい。即ち、電熱帯を捩じると共に、これを排気流通方向で角度差をもって少なくとも２重に配置することで、排気流を乱して混合を促進させる。 As another mixing device 36, as shown in FIG. 4, a plurality of cross sections in a circular hole 36C of the plate member 36A are arranged in a spiral shape with an angular difference (for example, an angular difference of 90 °). You may attach the fin 36E which consists of at least 2 twisted electrotropics. That is, while twisting the electrotropics and arranging them at least twice with an angular difference in the exhaust circulation direction, the exhaust flow is disturbed to promote mixing.
このようにすれば、混合装置３６の基本的な機能に加え、図２に示すような支持部材３６Ｄを使用しなくとも、電熱帯からなるフィン３６Ｅを取り付けることができ、部品点数の削減によるコスト低減などを期待することができる。 In this way, in addition to the basic function of the mixing device 36, the fin 36E made of electrotropics can be attached without using the support member 36D as shown in FIG. Reduction can be expected.
なお、本発明は、液体還元剤又はその前駆体として、尿素水溶液を使用する排気浄化装置に限らず、炭化水素を主成分とする軽油などを使用する排気浄化装置にも適用することができる。また、本発明は、連続再生式ＤＰＦ装置２８とＳＣＲ触媒３２及び酸化触媒３４とが略Ｓ字状の排気通路に配設される排気浄化装置にも適用可能である。 Note that the present invention can be applied not only to an exhaust gas purification device that uses an aqueous urea solution as a liquid reducing agent or a precursor thereof, but also to an exhaust gas purification device that uses light oil or the like mainly composed of hydrocarbons. The present invention is also applicable to an exhaust purification device in which the continuously regenerating DPF device 28, the SCR catalyst 32, and the oxidation catalyst 34 are disposed in a substantially S-shaped exhaust passage.
２６ 排気管（排気通路）
３０ 噴射ノズル
３２ ＳＣＲ触媒
３６ 混合装置
３６Ｄ 支持部材
３６Ｅ フィン
26 Exhaust pipe (exhaust passage)
30 injection nozzle 32 SCR catalyst 36 mixing device 36D support member 36E fin
Claims (3)
前記ＳＣＲ触媒の排気上流に液体還元剤又はその前駆体を噴射供給する噴射ノズルと、
前記噴射ノズルと前記ＳＣＲ触媒との間に位置する排気通路に配設され、前記噴射ノズルから噴射供給された液体還元剤又はその前駆体と排気との混合を促進するフィンを備えた混合装置と、
を含んで構成され、
前記混合装置のフィンは、電力の供給を受けて発熱する電熱帯であって、前記排気通路の横断面上に配設された、排気流の上流及び下流に複数回屈曲する少なくとも１条の電熱帯からなることを特徴とするエンジンの排気浄化装置。 An SCR catalyst that selectively reduces and purifies nitrogen oxides in exhaust using a reducing agent;
An injection nozzle for injecting and supplying a liquid reducing agent or a precursor thereof upstream of the exhaust of the SCR catalyst;
A mixing device that is disposed in an exhaust passage located between the injection nozzle and the SCR catalyst, and includes a fin that promotes mixing of the liquid reducing agent injected from the injection nozzle or a precursor thereof and the exhaust; ,
Comprising
The fins of the mixing device are electrotropics that generate heat when supplied with electric power, and are disposed on the cross section of the exhaust passage, and at least one electric wire that is bent a plurality of times upstream and downstream of the exhaust flow. An exhaust emission control device for an engine characterized by comprising a tropical zone.
前記ＳＣＲ触媒の排気上流に液体還元剤又はその前駆体を噴射供給する噴射ノズルと、
前記噴射ノズルと前記ＳＣＲ触媒との間に位置する排気通路に配設され、前記噴射ノズルから噴射供給された液体還元剤又はその前駆体と排気との混合を促進するフィンを備えた混合装置と、
を含んで構成され、
前記混合装置のフィンは、電力の供給を受けて発熱する電熱帯であって、前記排気通路の複数の横断面上において、前記排気通路を横切るように角度差をもって配設された、螺旋状に捩じられた少なくとも２条の電熱帯からなることを特徴とするエンジンの排気浄化装置。 An SCR catalyst that selectively reduces and purifies nitrogen oxides in exhaust using a reducing agent;
An injection nozzle for injecting and supplying a liquid reducing agent or a precursor thereof upstream of the exhaust of the SCR catalyst;
A mixing device that is disposed in an exhaust passage located between the injection nozzle and the SCR catalyst, and includes a fin that promotes mixing of the liquid reducing agent injected from the injection nozzle or a precursor thereof and the exhaust; ,
Comprising
Fin of the mixing device is an electrical heating band which generates heat by receiving a supply of electric power, Oite on a plurality of cross-section of the exhaust passage, disposed at an angle difference across the exhaust passage, helical it consists of at least two rows heating zone which is twisted Jo exhaust purification device characteristics and to Rue engine a.
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| US20170284250A1 (en) * | 2016-03-31 | 2017-10-05 | Johnson Matthey Public Limited Company | IN-EXHAUST ELECTRICAL ELEMENT FOR NOx STORAGE CATALYST AND SCR SYSTEMS |
| JP6972967B2 (en) * | 2017-11-27 | 2021-11-24 | いすゞ自動車株式会社 | Post-processing control device and post-processing control method |
| CN109838290A (en) * | 2017-11-29 | 2019-06-04 | 北汽福田汽车股份有限公司 | Flow mixing device, exhaust-gas treatment system and the vehicle of exhaust-gas treatment system |
| CA3139576A1 (en) * | 2018-03-29 | 2019-10-03 | Emissol Llc | Methods and devices for controlling urea mixers to reduce nox emission from combustion engines |
| CN108843432A (en) * | 2018-07-27 | 2018-11-20 | 江南大学 | A kind of turbulence structure and combined type SCR mixer applied to vent gas treatment |
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| JPS52122964A (en) * | 1976-04-09 | 1977-10-15 | Shimazaki Mixing Equip | Mixer in pipe line |
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| ATE233368T1 (en) * | 1997-03-13 | 2003-03-15 | Haldor Topsoe As | METHOD FOR THE SELECTIVE REDUCTION OF NOX IN EXHAUST GAS |
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| JP2005155404A (en) * | 2003-11-25 | 2005-06-16 | Komatsu Ltd | Exhaust emission control device for internal combustion engine |
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